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Discontinued Operations - Summary of Financial Information for Fiber Optic Licensing Operations (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Major classes of line items constituting pretax income from fiber optic licensing operations:        
Revenues $ 8,736 $ 25,186 $ 59,998 $ 78,653
Cost of services (including depreciation) 3,037 9,118 24,748 29,329
Selling, general and administrative expenses 366 4,027 10,247 12,699
Amortization of intangible assets 138 413 963 1,238
Other income (expense) items that are not major   2 10 4
Net income before taxes of discontinued operations related to fiber optic licensing operations related to major classes of income before taxes 5,195 11,630 24,050 35,391
Pretax gain on the disposal of the discontinued operations 271,833   271,833  
Total pretax gain on discontinued operations 277,028 11,630 295,883 35,391
Provision for income taxes 103,816 4,905 102,774 14,071
Net income from discontinued operations related to fiber optic licensing operations as presented in the statements of operations $ 173,212 $ 6,725 $ 193,109 $ 21,320